Visualize an image pixel buffer with a bit depth of 3 i.e. each pixel having 3 bits of data
Question
What are the tools/standards/file formats by which I can visualize my image pixel buffer on which each pixel has 3 bits?
My Language is Go.
PNG header
Bit depth: 3 vs 4
An image pixel buffer is created on which each pixel has only 3 bits of data. Having saved it as a PNG file with header info of bit depth set to 3, I cannot visualize it:
But when the PNG file header info for bit depth is set to 4, I can be previewed, although I'm not sure if the preview is actually correct or wrong:
The change that I'm making is just the header info for bit depth, that's all. My code is in Golang:
// Set bit depth and color type.
e.tmp[8] = 3 // Preview is not possible.
e.tmp[8] = 4 // Preview is possible.
e.tmp[9] = ctGrayscale
PNG standard
According to Wikipedia we have:
The standard allows indexed color PNGs to have 1, 2, 4 or 8 bits per pixel; grayscale images with no alpha channel may have 1, 2, 4, 8 or 16 bits per pixel. Everything else uses a bit depth per channel of either 8 or 16.
Having saved it as a PNG file with header info of bit depth set to 3
No, you did not. As you note yourself at the end of your question, there is no such thing. PNG supports 1, 2, 4, 8, and 16 bits per pixel. Whatever you saved is not a valid PNG file, and whatever you were using to view it rightfully rejected it.
You will need to use at least four bits per pixel with PNG. I am not aware of an image format that represents the uncompressed data as three bits per pixel. The uncompressed representation should not matter, as it is transient. Either you store it as compressed, where PNG compression will use approximately three bits per pixel in the compressed data anyway, if only eight values out of the 16 are used. Or you store it in memory as one byte, eight bits, per pixel, in order to deliver it to whatever will display it on the screen.
I just tried PNG compression with random 3-bit values in 4-bit pixels. The compressed data portion is 3.03 bits per pixel.
- How to create a POST payload from a slice
- Invoke kubernetes operator reconcile loop on external resources changes
- How to query to get random document with Referenced Documents
- Go checking for the type of a custom Error
- Getting 404 error in Golang while sending get request to a route
- go.mod file getting updated when running go mod tidy
- How do you apply a recursive formatting with Go Templates (Helm)?
- Is there an equivalent to Java's String intern function in Go?
- ERROR DockerEnvironmentFactory: Docker container xxxxx logs, when trying to run Apache Beam pipeline written in Go using Spark runner
- SkyScanner RapidAPI not providing return flight
- How to run a command once in Docker compose
- Cobra init not working,: Command not found
- Why is the go compiler flagging my variable as unused?
- Error message "go: go.mod file not found in current directory or any parent directory; see 'go help modules'"
- Checking if a value exists in sqlite db with Go
- Syntax error at end of input in PostgreSQL
- Why read channel with go fmt.Println(<-c) doesnt work?
- Why DIDN'T I get an indenation error in my golang code?
- panic: runtime error: invalid memory address or nil pointer dereference when running Blockchainr
- golang unzip Response.Body
- Presigned URL PutObject with Flutter and Golang
- Pick a random value from a Go Slice
- Unmarshal xml into custom struct - how to handle different structures for the same tag
- Go install, but repo and module declared are not a match
- Golang map value modifed after append
- Why does the following example with condition variables as synchronization primitives have a data race?
- What would be the best way to handle many I/O connections in GoLang?
- How to build a release version binary in Go?
- What is a use case for public fields on privat structs in Go
- Get go doc to follow a type alias and function variable